Abstract
Pure gas and hydrocarbon vapor transport properties of blends of two glassy, polyacetylene-based polymers, poly(1-trimethylsilyl-1-propyne) [PTMSP] and poly(1-phenyl-1-propyne) [PPP], have been determined. Solid-state CP/MAS NMR proton rotating frame relaxation times were determined in the pure polymers and the blends. NMR studies show tit PTMSP and PPP form strongly phase-separated blends. The permeabilities of the pure polymers and each blend were determined with hydrogen, nitrogen, oxygen, carbon dioxide, and n-butane. PTMSP exhibits unusual gas and vapor transport properties which result from if extremely high free volume. PTMSP is more permeable to large organic vapors, such as n-butane, than to small, permanent gases, such as hydrogen. PPP exhibits gas permeation characteristics of conventional low free volume glassy polymers; PPP is more permeable to hydrogen than to n-butane. In PTMSP/PPP blends, both n-butane permeability and n-butane/hydrogen selectivity increase as the PTMSP content of the blends increases.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2209-2222 |
| Number of pages | 14 |
| Journal | Journal of Polymer Science, Part B: Polymer Physics |
| Volume | 34 |
| Issue number | 13 |
| DOIs | |
| State | Published - Sep 30 1996 |
| Externally published | Yes |
Keywords
- Blends
- Bruggeman model
- Gas and vapor transport
- Maxwell model
- NMR
- Poly(1-phenyl-1-propyne)
- Poly(1-trimethylsilyl-1-propyne)
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Polymers and Plastics
- Materials Chemistry